[heap] Drop filler objects on marking deque.
BUG= Review-Url: https://codereview.chromium.org/2202633002 Cr-Commit-Position: refs/heads/master@{#38220}
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BUG= Review-Url: https://codereview.chromium.org/2202633002 Cr-Commit-Position: refs/heads/master@{#38220}